Agito awakens Toola from cryogenic sleep. Toola has some adjusting to do, as a science experiment Gone Horribly Wrong has left the moon a bit less intact than it used to be, has turned plants into destructive forces of nature, and has made water a bit scarce. As she's attempting to adjust to her new life, Shunack, another former cryogenic sleeper, arrives.Shunack informs Toola that there's a way to return things to the way they were before. Toola, not coping with the murderous forest and other changes well, agrees to leave with him. Agito doesn't think this is a good idea, and the forest and its representatives agree with him. Agito is enhanced with some of the forest's energy so he can stand up to Shunack and the legion of soldiers and Humongous Mecha under his command. As this goes on Toola starts seeing glimpses of just how militant Shunack can be, and starts to figure out that putting things back to "normal" is going to cause a lot more destruction than she thought.
This Movie Provides Examples Of:
Artistic License - Geology: In the climax a volcano is able to stand up on mechanical legs, becoming a movable weapon of mass destruction, despite logically being cut off from the mantle.
Artistic License - Physics: At the end of the volcano scene mentioned above, Agito jumps off the side of the mountain with Toola and both of them fall a good thousand feet. The landing actually kicks up a plume of dirt. Both are totally fine. Now, even if Agito is a silver-haired superman Toola is just a normal human and the sudden stop should have snapped her neck.
Badass Grandpa: Only shown in one scene, but one of three enhanced funders of the Neutral City.
Black and Gray Morality: At first the entire point of the film seems to be an AnviliciousGreen Aesop however it also kind of appears to be a Deconstruction of one as well. Ragna is a seemingly anti environmental ruthless empire, however the altered "eco-system" of the Earth is a sentient, animalistic, mass murdering, force of literal nature that demands that its protectors be turned into trees.
Broken Aesop: Remember, we have to live in harmony with the creepy sentient forest that cuts off our water supply if we don't bow to its wishes. Trying to undo humanity's mistake in creating killer vine-dragon-things is bad.
Convection Schmonvection: Near the end of the movie, Agito runs down an exploding volcano with Toola in his arms while being closely pursued by a very fast (and presumably very hot) lava flow. The ground he's running across is glowing red and actually looks molten in some places and yet neither of them suffer so much as a singed hair.
Creepy Twins: The twin forest spirits. Especially the one with the high, squeaky voice.
Cursed with Awesome: Those who become enhanced by the forest gain extraordinary super-strength, but using that power can gradually cause Metamorphosis and effectively an early death. When their time comes, they mostly accept their fate, claiming to finally be in peace with nature and themselves.
Fastball Special: A comical variation - after Agito gets enhanced, his inaugural battle on behalf of the forest begins with a Druid unceremoniously kicking him off a mile-high cliff and into the midst of Ragna soldiers siphoning water. He immediately recovers with his Crowning Moment of Awesome.
Goomba Springboard: Agito is the victim of a rather humiliating one when he fights Shunack. Shunack sends him timbling and relieves him of his love interest in one easy movement, with a smug look on his face.
Gone Horribly Wrong: Genetically modified plants break the moon in half, land on Earth, and kill most of humanity when one of the scientists, Shunack, got impatient and decided to speed the experiment along a little.
Lost Superweapon: Much of the plot involves the search for an old-world device intended to reclaim the world from the feral forest. It turns out to be a walking volcano cannon, which is as ridiculous as it sounds. The precursors obviously played a lot of Dwarf Fortress.
Mindscrew: So many parts of the movie and its world produce more questions than answers — flat whats abound.
Mystical White Hair: Agito, though it's not much of a spoiler, since his hair is showed white in the advertisements for the movie... and is also the Japanese title. Gin-iro no Kami no Agito, lit. "Silver-haired Agito". Subtle.
One-Man Army: Anyone, who was touched by the Forest. Agito doesn't seem to have problem with jumping great hights and singlehandly destroying tanks.
Literally singlehandedly, when he slices a tank in half with one hand.
Romanticism Versus Enlightenment: The Forest and Ragna, though which side is which is debatable. On the one hand there's the whole nature vs. science thing, on the other Ragna and especially Shunack are obsessed with the past while the Forest is a genetically engineered Hive Mind of plants (possibly a biotech Posthuman) that brought down the old order.
Ruins of the Modern Age: Most cities are completely taken over by the Forest and are reduced to rubble, while only a few buildings still stand. This hits Toola especially hard, as she remembers how the city used to be.
The Empire: Everything about Ragna screams this trope, from their blood red armor to their Humongous Mecha to their heavily industrialized, military society. However, they're far from Always Chaotic Evil. For the most part, they're generally decent people trying to live independently from the Forest, which is easy enough to see as a monstrous, tyrannical entity.
The general obnoxiousness of the forest and anviliciousness of the message has a lot of people Rooting for the Empire.
Tron Lines: The entryway to the volcano that contains E.S.T.O.C. lights up with these in response to Tula's raban.